Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with an animated graphical user interface showing our new design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a fourth image thereof;

FIG. 5 is a fifth image thereof; and,

FIG. 6 is a sixth image thereof.

The broken lines in the figures show portions of the display screen or portion thereof with an animated graphical user interface which form no part of the claimed design.

The dot-dash lines in the figures represent a display screen and boundary line and form no part of the claimed design.

The appearance of the animated user interface sequentially transitions between the images shown in FIGS. 1-6. The process or period in which one image transitions to another forms no part of the claimed design. 

CLAIM We claim the ornamental design for a display screen or portion thereof with an animated graphical user interface, as shown and described. 